Adobe 22020807 User Guide - Page 107

USING ACROBAT 9 PRO 101 Creating PDFs Pages Specifies which pages to convert to PDF. Embed Thumbnails Embeds a thumbnail preview for each page in the PDF, increasing the file size. Deselect this setting when users of Acrobat 5.0 and later will view and print the PDF; these versions generate thumbnails dynamically each time you click the Pages panel of a PDF. Optimize For Fast Web View Restructures the file for faster access (page-at-a-time downloading, or byte serving) from web servers. This option compresses text and line art, overriding compression selections on the Images panel. Default Page Size Specifies the page size to use when one is not specified in the original file. EPS files give a bounding box size, not a page size. Images panel options The options in the Images panel specify compression and resampling for color, grayscale, and monochrome images. You may want to experiment with these options to find an appropriate balance between file size and image quality. The resolution setting for color and grayscale images should be 1.5 to 2 times the line screen ruling at which the file will be printed. The resolution for monochrome images should be the same as the output device, but be aware that saving a monochrome image at a resolution higher than 1500 dpi increases the file size without noticeably improving image quality. Images that will be magnified, such as maps, may require higher resolutions. Note: Resampling monochrome images can have unexpected viewing results, such as no image display. If this happens, turn off resampling and convert the file again. This problem is most likely to occur with subsampling, and least likely with bicubic downsampling. The following table shows common types of printers and their resolution measured in dpi, their default screen ruling measured in lines per inch (lpi), and a resampling resolution for images measured in pixels per inch (ppi). For example, if you were printing to a 600-dpi laser printer, you would enter 170 for the resolution at which to resample images. Printer resolution 300 dpi (laser printer) 600 dpi (laser printer) 1200 dpi (imagesetter) 2400 dpi (imagesetter) Default line screen 60 lpi 85 lpi 120 lpi 150 lpi Image resolution 120 ppi 170 ppi 240 ppi 300 ppi Downsample (Off) Reduces image resolutions that exceed the For Images Above value to the resolution of the output device by combining pixels in a sample area of the image to make one larger pixel. Average Downsampling To Averages the pixels in a sample area and replaces the entire area with the average pixel color at the specified resolution. Subsampling To Replaces an entire area with a pixel selected from that sample area, at the specified resolution. Causes faster conversion time than downsampling, but resulting images are less smooth and continuous. Bicubic Downsampling To Uses a weighted average, instead of a simple average (as in downsampling) to determine pixel color. This method is slowest but produces the smoothest tonal gradations. Compression/Image Quality Applies compression to color, grayscale, and monochrome images. For color and grayscale images, also sets the image quality. Anti-Alias To Gray Smooths jagged edges in monochrome images. Choose 2 bit, 4 bit, or 8 bit to specify 4, 16, or 256 levels of gray. (Anti-aliasing may cause small type or thin lines to look blurry.) Last updated 9/30/2011